Internal-combustion engine



v w; W.,GORE.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED DEC. I. 1921.

1,411,343. PatntedA Ir.4,1922;

UNITED STATES PATENT WARREN v0. eons, or MAD son, WISCONSIN. ASSIGNOR:ro rotten & onson MFG. '00., or MADISON, Wisconsin, A CORPORATION orWISCONSIN.

INTERNAL-COMBUSTION ENGINE.

citizen of the United States, residing at Madison, in the county ofDane, State of Wisconsin, have invented certain new and usefulImprovements in Internal-Combustion Engines, of which the following is aspecificetion.

This invention relates to the art of internal combustion engines, havingreference more particularly to engines of the fourcycle type.

As is Well known, nieny internal comhus tion engines are provided with aclosed crankcase, Which letter is equipped with a breather to allow theheated air and gases that have passed by the piston to escape from thecrank-case and be replaced by cool air drawn in on the up or out strokesof the piston. \Vhere such engines are used indoors, the gases emittedby the breather ere noxi'cus and objectionable, and hence, in engines ofthis type, and especially those designed for indoor use, it is commonpractice to provide connection from the crank-case to the intakemanifold of the engine through which such noxious gases are conducted tothe cylinder instead of being expelled to the atmosphere.

My present invention relates more specifically to an improved deviceforthus conducting the crank-case gases to the engine cylinder on thesuction strokes of the piston; and the purposes served by the specificcon-- structionhereinafter described in detail and the advantagesflowing therefrom, will he pointed out after the description of thestructure itself, which latter is illustretedin two practical forms orembodiments in the accompanying drawing, wherein Fig. 1 is e sectionalelevation of those parts of a single cylinder four-cycle engine .Wlllhwhich my present improvement di rectly cooperates; and

Fig. 2 is an enlarged sectional elevation of a modified structureembodying the same principle.

Referring first to Fig. 1, 5 designates the closed crank-case, 6 thecylinder, 7 the piston, 8 the crank she-ft, 9 the connecting rod, 10 thecylinder-head, 11 the intake valve and 12 the exhaust valve of a singlecylinder four-cycle engine. Connected to the intake side of the cylinderhead. is an elbow-shaped supply pipe or manifold 13- containing a.

Specification of Letters Patent.

Patented Apr. 4, 1922.

Application filed December 1, 1921. Serial No. 519,098.

butterfly governor valve is. In the top of the crank-case 5 is abreather hole 15, over which is secured a laterally extending breatherpipe section 16 formed on its upper side with a valve seat 131' on whichis mounted on ordinary check or breather valve 18. v

' Connected in between the manifold 13 end the breather pipe 16 is atubular connection comprising, in the instance shown, a veporizedexisting 19 attached to the lower end of the manifold 13, and a breathertube 20, the lower end of which is mounted in-e seat 21 on the breatherpipe 16 and surrounding the breather valve '18, and the upper end ofwhich is similarly fitted to a seat 22 formed the veporizerll) is led a'fuel supply ipe 23 which "delivers the oil to an upstanding "at nozzle24: projecting into the lower'en'd of t e manifold 13; In the vaporizer19' is also mounted it butterfly choke valve 25 for throttling the airwhen starting up the englue. 2 i

The breather tube section 20 of this tuhiu lar connection between thecrankcase and the intake manifold is formed near its up per end with anammlerirow of holes 26 constituting air ports for the intake of stmospheric air for the fuel mixture. Attached at its wide end to the innersurface of the breather tube 20 slightly below the air holes rected intothe vaporizer l9, whence they How through the latter and the manifold 13to the cylinder on each suction stroke of the piston.

On the upper end of the breather tube 20 is preferably applied a shortdepending conical flange 29which lies opposite and encircles the annularrow of air ports 26.

In the construction described, the two inner and outer conical members27 and 29 perform important functions. The internal conical member 2'?possesses two main functions,'one of which is to prevent the crankcasegases from shootingout through the air ports 26, While the other is toprevent any excess fuel that collects or condenses on the sides of thevaporizer or manifold. from dropping down onto from'which position intothe crank-case.

in this way drips downintothe annular,

the breather valve, it might work down Any fuel that collects space atthe base of the conical ring 27, from which it is picked up on thesucceeding suction strokes of the engine. The hollow conical flange 29serves to reduce the sharp hissing-noise of the inrushing air, thus act-1 formed in its lower end and the breather ing as ,asilencer.

F- g. 2 shows amodification embodying the same principle. In this formthe vaporizer 19' has an annular row of air inlet ports 26 tube is"formed with a conical upper end 27" that is fitted into the lower endof the vaporizer, its narrow top opening 28 lying slightly above the airports 26. The outer conical flange 29? is formed on the vaporizer 19',extending downwardly around the air ports 26. It will be manifest thatthis modification has the same mode of action,

functions, and advantages as the form of the invention shown in Fig. 1,differing from the latter only in a transfer 01"? certain of theelements from the breather tube to the lower ports, said bafile ringserving to deflect the" crank-case gases flowing through said tubular conection upwardly past'said air ports andinto said intake manifold.

2. In an internal combustion engine, the

combination with a cylinder, crankcase, and

surrounding said air ports. intake manifold, of a tubular connection ber'tween said crank-case and manifoldformed with lateral air ports,breather valve in the lower portion of said tubular connection, aconical baffle ring within said tubular connection and disposed oppositesaid air ports,

said baflie ring serving to deflect the crankcase gases flowing throughsaid tubular connection upwardly past said air ports and into saidintake manifold, and a, dependingexternal flange on said tubularconnection surrounding said air ports. a 3. In an internal combustionengine, the

combination with a cylinder, crank-case, and

intake manifold, of. a vaporizer connected to the lower end of saidintake manifold, a

breather tube connected between the lower end of said vaporizer and saidcrankcase and formed with lateral airports near its upper end, abreather valve in the lower portion of baflle ring secured at its.lowe'r'wide end to the inner surface of said breather tube below saidbreather tube, and a conical said air ports and disposed opposite thelatter, said baiil'e ring serving to deflect the crank-case gasesflowing through said breather tube'upwardlypast said air ports and intosaid vaporizer and also to retain excess fuel collecting within thevaporizer.

4. In an internal combustion engine, the combination with a cylinder,crankcase, and intake manifold, of a vaporizer connected to the lowerend of said manifold, a breather tube connected between said. vaporizerand said crank-case and itormediwith lateral air ports near its upperend, a breather valve in the lower portion of said breather tube, aconical bafiie ring secured'at its lower'wide end to the inner surfaceof said breather tube below said air ports and lying opposite thelatter, and an external depending conical flange on the upper end ofsaid breather tube W Benn w. eons.

